18.3J) Final Exam Review: Unit 3

Front

What is the function of an ammeter in a circuit?

Back

An ammeter measures the current flowing through a circuit.

Front

What is the unit of resistance?

Back

Ohm (Ω) is the unit of resistance.

Front

What is the formula to calculate voltage?

Back

Voltage (V) = Current (I) × Resistance (R) or V = I × R.

Front

What happens to the brightness of bulbs when an additional identical battery is added to a circuit?

Back

The bulbs will light as brightly as when the capacitor was first charged.

Front

What is the relationship between voltage and current in a linear graph?

Back

Voltage is directly proportional to current.

Front

How do you calculate current using voltage and resistance?

Back

Current (I) = Voltage (V) / Resistance (R) or I = V / R.

Front

What is the maximum current a light bulb with 5 ohms of resistance can handle?

Back

10 Amperes.

Front

If a hair dryer is plugged into a 120 Volt circuit with a resistance of 25 ohms, what is the current?

Back

4.8 Amperes.

Front

What is the effect of adding more batteries in series to a circuit?

Back

It increases the total voltage supplied to the circuit.

Front

What does it mean if a circuit is described as 'closed'?

Back

A closed circuit allows current to flow; it is complete and unbroken.